I've created templates in Frame 10 for a book that include TOC, index, and chapters. When I generate my book, the index generates, but it pushes my master page with the header to the end of the index instead of starting the index on the first master page. Does that make sense? Is there a tweak I can do or a step I left out that will keep the first master page at the front of the index?
FWIW, I've grown accustomed to having to apply a First page manually in various situations; most often when I split a file into two, but also (I think) at least the first time I generate a ToC or LoF page. Completely off the top of my head, do you have any non-generated content (such as a title "Index") at the start of your generated index? considering the behaviour I'm used to from my ToC, this might be enough to "fix" your master page choice.